用括号内单词的适当形式填空
1. I can't think of any possible _____ (explain) for her absence.
2. _____ (general) speaking, most people will help in such situations.
3. The key is used for _____ (lock) the door.
4. Last night he found it hard ____ (fall) asleep.
5. I've two _____ (knife). I use them to cut watermelons.
6. A little nervousness is only to be _____(expect) when you are starting a new job.
7. Mr. Li is ____ (think) to be costing software, companies millions of dollars a year.
8. --Has anyone been ____ (choose) to be the host of the charity show?
--Sorry, I don't know.
9. I know she won't come to join us unless she ____ (tell) to.
10. NO SMOKING should _____ (see) in the stores even in many parts of the city.